单选题 Parents of wailing(哀号)babies, take comfort: You are not alone. Chimpanzee babies fuss. Sea gull chicks squawk. Burying beetle larvae tap their parents' legs. Throughout the animal kingdom, babies know how to get their parents' attention. Exactly why evolution has produced all this fussing, squawking and tapping is a question many biologists are trying to answer. Someday, that answer may shed some light on the mystery of crying in human babies. " It may point researchers in the right direction to find the cause of excessive crying," said Joseph Soltis, a bioacoustics expert at Disney's Animal Kingdom in Lake Buena Vista. Florida. Soltis published an article on the evolution of crying in the current issue of Behavioral and Brain Sciences. Young animals vary in how much they cry, squawk or otherwise communicate with their parents, and studies with mice, beetles and monkeys show that this variation is partly based on genes. Some level of crying in humans, of course, is based on gas pains and messy diapers. But as for the genetic contribution, you might expect that natural selection would favor genes for noisier children, since they would get more attention. Before long, however, this sort of deception may be ruinous. If the signals of offspring became totally unreliable, parents would no longer benefit from paying attention. Some evolutionary biologists have proposed that natural selection should therefore favor so-called honest advertisements. Some biologists have speculated that these honest advertisements may not just tell a parent which offspring are hungry. They might also show their parent that they are healthy and vigorous and therefore worth some extra investment. The babies of monkeys cry out to their mothers and tend to cry even more around the time their mothers wean(断奶)them. The mothers, in response, begin to ignore most of their babies' distress calls, since most turn out to be false alarms. " Initially, mothers respond any time an infant cries," said Dado Maestripieri, a primatologist at the University of Chicago. "But as the cries increase, they respond less and less. They become more skeptical. So infants start crying less. So they go through these cycles, adjusting their responses. " Kim Bard, a primatologist at the University of Plymouth in England, has spent more than a decade observing chimpanzee babies. "Chimps can cry for a long time if something terrible is happening to them, but when you pick them up, they stop," Bard said. "I've never seen any chimpanzees in the first three months of life be inconsolable. " Maestripieri and other researchers say these evolutionary forces may have also shaped the cries of human babies. "All primate infants cry. " Maestripieri said. "It's a very conserved behavior. It's not something humans have evolved on their own. "

单选题 What can be the most probable title of this passage?

【正确答案】 C

【答案解析】解析：本题是主旨题。文章的第一段和最后一段分别点明了主题。在第一段提到“Exactly why evolution has produced all this fussing，squawking and tapping is a question manybiologists are trying to answer．”，第二段接着说“Someday，that answer may shed some light onthe mystery of crying in human babies．‘It may point researchers in the right direction to find thecause of excessive crying，’”，由此可知科学家试图找出动物为什么嚎叫的原因，而这个问题的解决可能会提示出婴儿啼哭的原因。最后一段作者提到“…these evolutionary forces mayhave also shaped the cries of human babies．“All primate infants cry．”Maestripieri said．“It’s avery conserved behavior．It’s not something humans have evolved on their own．”．科学家认为自然界的进化可能也导致婴儿的啼哭，哭这种现象并不是人类独立形成的。因此，文章最贴切的题目应为“动物身上找到对人类婴儿啼哭的提示”，故选C。

单选题 Which of the following statement is true according to the passage?

单选题 What is implied in Paragraph 4?

【正确答案】 A

【答案解析】解析：本题是推理题。本段提到“If the signals of offspring became totally unreliable．parents would no longer benefit from paying attention．Some evolutionary biologists have proposedthat natural selection should therefore favor so-called honest advertisements．”，当父母意识到孩子在发假信号时，他们就不再关注这些信号了。有的进化生物学家认为自然选择可能因此会有利于那些发真信号的孩子。在此段的最后，作者提到“The mothers，in response，begin toignore most of their babies’distress calls，since most turn out to be false alarms．”，母亲开始忽略孩子的大多数嚎叫，因为大多数嚎叫是假的。由此可推断出，母亲会关注那些发出真实信号的孩子。故A正确。